Widely used in agriculture as a fungicide and pesticide, especially in vineyards and orchards to control fungal diseases like mildew. It is a key component of Bordeaux mixture, a traditional spray for protecting plants. Also applied in seed treatment to prevent fungal infections during germination. Commonly used in industrial settings for electroplating and metal finishing processes, where it serves as a source of copper ions in plating baths to coat surfaces with a thin layer of copper for conductivity or corrosion resistance. Used in water treatment to control algae growth in reservoirs, ponds, and swimming pools due to its algicidal properties. Applied in small, controlled amounts to reduce excessive aquatic plant growth. In education and research laboratories, it serves as a reagent in various chemical tests and demonstrations, including crystal growth experiments and electrochemical cells. Employed in the preparation of other copper compounds and in analytical chemistry for qualitative and quantitative analysis, such as testing for proteins in the biuret test. Also used in animal nutrition as a dietary supplement in trace amounts to prevent copper deficiency in livestock, though it must be carefully dosed due to its toxicity at higher levels.